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Publication numberUS5135613 A
Publication typeGrant
Application numberUS 07/650,309
Publication dateAug 4, 1992
Filing dateFeb 4, 1991
Priority dateFeb 4, 1991
Fee statusLapsed
Publication number07650309, 650309, US 5135613 A, US 5135613A, US-A-5135613, US5135613 A, US5135613A
InventorsJohn J. Waldmann
Original AssigneeMaxichem, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for controlling pitch in paper industry using PGAC or PGUAC
US 5135613 A
Pitch formation in a paper mill is controlled by a chemical composition of a water-soluble polymer of polycyanoguanidineammoniumchloride (PGAC) or polycyanoguanidineureaammoniumchloride (PGUAC).
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What is claimed is:
1. A method for controlling pitch in paper mills, comprising incorporating in the method, at a point prior to where pitch deposits occur, an effective amount of a composition consisting essentially of a water-soluble polymer selected from the group consisting of polycyanoguanidineammoniumchloride or polycyanoguanidineurea ammoniumchloride, said polymer having a molecular weight from about 500 to 100,000.
2. The method of claim 1 wherein at least 0.25 ppm of composition is incorporated.
3. The method of claim 1 wherein from about 50 to 1000 ppm of the composition is incorporated.
4. The method of claim 1 wherein the composition is incorporated at a headbox or hollander before the pitch deposits occur.

The present invention relates to composition of matter which are useful for inhibiting the pitch formation in paper mill and pigment dispersion and deposit control.

The mineral salts such as calcium or magnesium carbonate, or mixed salts creat very difficult problems in that such salts are absorbed by causing formation of crystal deposits. In the kraft or other alkaline line pulping process where surfactants, dispersants and other agents are used, the removal of the deposits from pulp-mill equipment is very costly. Production must be stoped for equipment cleaning operation and the presence of volatile organic solvents, which most of the time include petroleum, is dangerous and very unhealthy to worker personnel.

The deposit of pitch and/or pigments in pulp slurries occurs throughout the paper manufacturing process. The term "Pitch" per se and the other gums, rosin and resin which result from the production of cellulose fiber by the pulping step of paper manufacture, cooking and mechanical process during the pulping by the kraft, ground wood or sulfite process produce the pitch and are incorporated in the "Pitch" terminology. The mechanical process employs beating, hydrating, refining and bleaching. The pitch agglomerate, or in crystal form, deposits, or frequently causes the formation of spots or holes in the sheet formed or may adhere to the wire or press rolls or dries rolls and cause tearing of the sheet, or numerous imperfections of sheets.


The most efficient prior pitch control agents are sodium salts of sulfonated naphthalene-formaldehyde condensate, non-ionic dispersants, anionic polymers, sodium polyacrylate and arylsulfonic acid condensate, polyphosphates, terpolymers, ethoxylated organic substances like phenols, tall oils, (co) polymers of ethylene oxide and propylene oxide, vicinal epoxide and phenol, blend of kerosine-emulsifiers, and special cationic wet additives. Such prior art pitch control processes are disclosed by U.S. Pat. Nos.: 2,144,756; 2,399,489; 2,716,058; 2,999,045; 3,081,219; 3,446,700; 3,639,208; 3,840,489; 3,873,417; 3,992,249; 4,184,912; 4,190,491; 4,673,460; 4,634,451; 4,657,593; 4,818,288; 4,867,972; 4,952,277 which are incorporated by reference herein. All the methods described in these patents are still inefficient as pitch, or additive control agents.

The invented products, water-soluble cationic, or cationic-nonionic, or nonionic charged guanidine derivatives such as guanidine, or cyanoguanidine, or biguanidine, or guanylurea, or substituted guanidine polymer(s), or resins, or copolymers with urea, or amines, or N-hydroxy, or N-hydroxyalkyl amines, or their resins, or melamine-aldehyde resins protonized, or quaternized, or hydroxy, or hydroxyalkyl-s-triazine-2,4 amine products protonized, or quaternized, or aminoplast resins, or those organic blends, or their alloys, are very efficient as pitch control additives in pulping operations, including introduction prior or after digestion in the stock-chest, or even in the head box, hollander, or other feeding points, or the papermaking machine, or as additive for sizing, or improved fillers retention, or for improvment of wet strength of paper. The deposit of adhesive in pitch particles from water suspension of cellulose fiber is prevented from depositing on surface of pulp-making equipment. In the pitch control operation it is preferred to add the additives early in the pulping or papermaking stage before the pitch is coagulated on the pulp during the papermaking operations. The additives are added at an effective amount to the pulp material at dosage from about 0.02 to 2.0 weight percent (% bw) additives to dry pulp, or can be used in formulation with nonionic, or anionic surfactants, or nonionic or charged polymers, or (co)polymers. The additive products are more economical than any other polymeric materials in the market, and more efficient then well known products in the art today.


It is principal object of this invention to provide a chemical composition useful for pitch control, or in paper making processes. It is also an object of this invention to provide a method for controlling pitch, or filler dispersions, in papermaking, or pulp refining process. The additive of the invention are added at a sufficient amount, at a point prior to where pitch deposits occur, or in a paper making process at a rate of at least 0.25 ppm to 1000 ppm, based on the weight of the dry pulp. Other objects will appear hereinafter.

The term ppm means parts of polymer, or resin by weight per million parts by weight of aqueous phase of the fibrous suspension. Another big advantage of this invention is that in the pitch control process the use of expense solvents, or steam cleaning the machinery which causes loss of production is eliminated. To avoid the forgoing problems, it was found advantageous to add to the various fiber slurries a small amount of the described aqueous polymer, aqueous resin solution of this invention.


The invention generally relates to aqueous organic blend(s), or alloy(s), polymer or copolymer(s), or resin(s), or resin blend(s) of the general formula:

-[X]n -=[B]x +[C]y 

wherein n=500 to 100,000 molecular weight (Mw); ##STR1##

B is a water-soluble cationic, nonionic, or mixture cationic-nonionic charged guanidine derivative selected from the group consisting of guanidine, cyanoguanidine, biguanidine, guanylurea, their polymers, copolymers, resin, copolymer with urea, amines, N-hydroxyalkyl amines, alkanolamines, melamine, hydroxy or hydroxyalkyl-s-triazine-2,4,6 or 2,4 amines, aldehyde condensate, protonized or quaternized;

C is a water-soluble cationic, nonionic, or mixture cationic-nonionic charged melamine derivative selected from the group consisting of melamine, hydroxy or hydroxyalkyl-s-triazine-2,4,6 or 2,4 amine aldehyde condensate polymers, copolymers, resin or blends, guanylmelamine, protonized or quaternized products;

Z is a divalent substituted or unsubstituted organic radical;

R refers to hydrogen, bridge cationic, multiple cationic charges, protonization or quaternization agents selected from the group consisting of inorganic or organic acids, ammonium salts (Cl, SO4, NO3, CH3 COO), methyl halide or alkyl (C1 -C2) sulfate, which vary from 0% to 80% by weight, and at least one of B or C is positive;

X is defined by the individual molecular weight which may vary from 500 to 100,000 of the water-soluble polymer, copolymer, or resin used;

n is 500 to 100,000 molecular weight;

x is 0% to 100% by weight;

y is 0% to 100% by weight and at least one of B, C is positive.

Mixtures of the above inorganic, or inorganic-organic, or organic, or blend(s), polymer(s), or copolymer(s), are described in U.S. Pat. Nos. 4,891,422, 4,902,779, and U.S. patent application Ser. No. 07/409,396 filed Sep. 19, 1989 filed Aug. 11, 1987.


This invention is based on water soluble polymers, resins, or polymer blends. Polyblends may be made from polymeric components by mixing, or compounding them together. This invention concerns homogeneous (compatible) blends, a single phase mixture, which are compatible. The component B can be 0% to 100% by weight (bw) and component C can be 0% to 100% bw in composition, provided that at least one component is positive, which will determine the X value. So, the X can be B, C or mixture of B+C and not a reaction product; these are two independent products or species.

If Cy, y is zero (y=0) that means product C is not present at all, so B is 100%, or if it is used in diluted form, as example 50% bw, that means the rest is water since this invention concerns water soluble products, and not solvent type products.

The preparation of polyguanidine or polyguanidine compositions polymer, or (co)polymer(s), or resin(s), or alloy(s), or blend(s) is described in U.S. Pat. Nos. 4,891,422, 4,902,779, protonized or quaternized. The guanidine or melamine polymer(s), or resin(s) may be made in pH range from 0.5 to 11, preferably 5 to 9 and most preferably 3 to 5.5. In general, a process for preparation of polyguanidine, or polymelamine, or their organic blend comprises the steps of:

mixing guanidine derivatives such as guanidine, or cyanoguanidine, or hydroxy or hydroxyalkyl-s-triazine-2,4,6 or 2,4 amines with aldehyde(s) and water and preferably aliphatic amines, or polyamine or alkanolamine, or urea, or thiourea, adjusting the pH to the range of pH 3.0 to 10, heating the mixture from room temperature (RT) to about 110 C. for a period of 10 minutes to 4 hours, at from atmospheric pressure up to 0.25 to 25 Kg/cm2, the resin, or (co)polymer formed being protonized, or quaternized with mineral acid(s), or organic acid(s), or ammonium salts (of chloric, sulfuric, nitric acids), or quaternized by alkyl halide, or dialkyl (C1 -C2) sulfate, or halobenzyl, or arylsulfonic acid(s), at a temperature from about 45 C. to about 85 C. In the formula C, divalent radical Z is an aliphatic, heterocyclic, or aromatic substituted or unsubstituted melamine, or guanidine, or guanyl substituted such as melamine, or guanylmelamine, or acetoguanamine, hydroxy/or hydroxyalkyl-s-triazine-2,4,6/or 2,4 amines. The invention is further illustrated by the following examples. It will be understood that these examples are not intended as limiting the invention, but rather as disclosing the operation of the invention.


0.05% bw of polycyanoguanidineammoniumchloride (PGAC) was added to the pulp solids material before the headbox. The PGAC inhibited the agglomeration of pitch crystals and resin deposits, and the machine produced paper without interruption.


0.6% bw of polycyanoguanidineurea ammoniumchloride (PGUAC) was added to the pulp solids sulfite cellulose (paper pulp) in the hollander. The polycyanoguanidineurea ammoniumchloride (PGUAC) was added for 11 days and inhibited the agglomeration of the pitch crystals and resin deposits, and the machine produced paper without interruption.


1.0% bw of cationic polycyanoguanidineammoniumchloride was added to the pulp solids material before the headbox. The cationic polycyanoguanidineammoniumchloride inhibited the pitch formation and the machine produced paper without interruption.


One part of the product of Example No. 1 is mixed with 3 parts of the product of Example No. 3 and 0.6% bw of this mixture was added to the pulp paper in the hollander. The multicationic polycyanoguanidine ammoniumchloride for over 27 days inhibited the pitch formation on paper machine, or hollander walls, or wire and or felt.


The conditions of Example No. 4 were repeated by substituting the polycyanoguanidineammoniumchloride with cationic polyguanylmelamine quaternized (methyl sulfate) polymer blend. 1.95% bw was added before the headbox. The pitch deposits were inhibited and the machine produced paper without interruption.

The sheet paper made also from this product was found to have good resistance to bursting after 30 seconds or 30 minutes immersion in water.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3290310 *Dec 17, 1964Dec 6, 1966Ciba Ltd2, 4, 6, 8, 9-pentaaza-bicyclo-[3, 3, 1]-nona-2, 6-dienes and process for their manufacture
US3703563 *Jun 21, 1971Nov 21, 1972Diamond Shamrock CorpPolyacrylamide-epoxidized aminoplast-urea condensates
US4566986 *Aug 31, 1984Jan 28, 1986Waldmann John JFlocculating agents and processes for making them
US4765867 *Jul 2, 1986Aug 23, 1988Betz Laboratories, Inc.Pitch control process utilizing quaternized polyamine ionene polymer
US4891422 *Jun 27, 1985Jan 2, 1990Maxichem, Inc.Compositions of inorganic-organic alloy with high nitrogen content polymers and their manufacture
US4902779 *Mar 21, 1986Feb 20, 1990Waldmann John JCompositions of inorganic -organic alloy with highly charged nitrogen content polymers and their manufacture
US4923566 *Apr 26, 1989May 8, 1990Nalco Chemical CompanyMethod of pacifying stickies in paper
US4997523 *Jun 20, 1990Mar 5, 1991Betz Panerchem, Inc.Method for effectively breaking up latex-coated paper during pulping to decrease the potential for white pitch deposition
Non-Patent Citations
1Gard "Some Practical Aspects of Chelation in Papermaking" TAPPI, vol. 47, No. 1 Jan. 1964.
2 *Gard Some Practical Aspects of Chelation in Papermaking TAPPI, vol. 47, No. 1 Jan. 1964.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5659011 *Sep 23, 1994Aug 19, 1997Waldmann; John J.Agents having high nitrogen content and high cationic charge based on dicyanimide dicyandiamide or guanidine and inorganic ammonium salts
US7935222 *Mar 4, 2005May 3, 2011Kemira Chemicals, Inc.Papermaking method using one or more quaternized dialkanolamine fatty acid ester compounds to control opacity and paper product made thereby
US8048268 *Oct 27, 2009Nov 1, 2011Enzymatic Deinking Technologies, LlcMethod of controlling organic contaminants in pulp and paper making processes
US8524042 *Aug 22, 2011Sep 3, 2013Hercules IncorporatedMethod of treating paper forming wire surface
US20120043040 *Aug 22, 2011Feb 23, 2012Fushan ZhangMethod of Treating Paper Forming Wire Surface
EP0674046A2 *Mar 8, 1995Sep 27, 1995Bayer AgProcess for controlling the impurities in papermaking
U.S. Classification162/199, 162/168.2, 162/166, 162/DIG.4, 162/164.6
International ClassificationD21H23/14, D21H17/50, D21H21/02
Cooperative ClassificationY10S162/04, D21H17/50, D21H23/14, D21H21/02
European ClassificationD21H23/14, D21H17/50, D21H21/02
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